Fix README to fit code snipped without scroll

Merge pull request #1 from ifraixedes/more-providers

0.1.0

Update README according last library update

Change HMAC validator func to support some providers specs

Add examples as test cases for Shopify, Twilio & Pusher

Improved doc presented in the README

Fixed repeated point in the Roadmap

Added a few more info in the README

Updated package.json description

Added README and LICENSE file

Added npmignore to exclude eslintrc files & test folder of the package

Added test & implementation of the first release

Initial commit; created package.json